Abbreviation for a four wheeled vehicle that has all four wheels powered by the engine. Four wheel drive is useful for driving off road, through snow, or other situations requiring oodles of traction.

Most people who have one don't know what to do with it. They drive an SUV because it's a status symbol, not because they need 4 wheel drive. I've seen one too many aging soccer mommies trying to parallel park a Ford Excursion in a spot barely big enough for a Toyota hatchback. Most of them probably don't even know what that extra gear shift lever is for. Hopefully the high price of gasoline will make these bubbleheads go back to driving nissans, and leave the 4x4s to people genuinely need them.
A "4x4" is a particular cut of lumber in the United States. More precisely, it was once a cut of lumber four inches wide and four inches thick. Currently, however, it is three and a half by three and a half inches. The length of the board is not specified.

"4x4" is spoken as "four by four" and refers to a board meeting this specification.

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